EP 0518525 A2 19921216 - Automated image calibration.
Title (en)
Automated image calibration.
Title (de)
Automatische Bildkalibrierung.
Title (fr)
Calibrage automatique d'images.
Publication
Application
Priority
US 71439291 A 19910612
Abstract (en)
A document processing system (DPS) having a closed feedback loop (291) for improving the quality of the printed form (314) of images that have been scanned into the DPS by scanners (224). The DPS includes a print path. The closed feedback loop automatically calibrates the print path such that printed documents have a true representation of the scanned image. The closed feedback loop operates as follows. First, a calibration image for the print path is created (404). Then, the calibration image is processed in the DPS (408). Then, distortions in the calibration image, caused by the processing, are measured (412). Then, calibration coefficients for offsetting the distortions are calculated (412). Finally, the image of the original document is precompensated by modifying the image according to the calibration coefficients (416). <IMAGE>
IPC 1-7
IPC 8 full level
B41J 5/30 (2006.01); G06T 11/60 (2006.01); H04N 1/407 (2006.01); H04N 1/409 (2006.01); H04N 1/60 (2006.01)
CPC (source: EP US)
H04N 1/4078 (2013.01 - EP US); H04N 1/6033 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0518525 A2 19921216; EP 0518525 A3 19931110; JP H05225305 A 19930903; US 5185673 A 19930209
DOCDB simple family (application)
EP 92304851 A 19920528; JP 15338892 A 19920612; US 71439291 A 19910612